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- W2602437639 abstract "During the past ten years, singlet exciton fission has been consideredas an effective carrier-multiplication method to improve the energy-conversionefficiency of photovoltaic devices. However, the question of whetherthis process requires thermal activation is still under debate. Althoughdifferent researchers have made a lot of effort, more explicit experimentalresults are still required in order to elucidate this basic question.In this work, highly efficient fission molecule, i.e. rubrene, wasselected to be the research object. By using co-deposition technique,we fabricated four rubrene-doped films in which rubrene moleculeswere uniformly mixed with other inert organic molecules, forming amorphouscomposite solid. For each sample, steady-state photoluminescence spectraand their time-resolved fluorescence decay curves were measured at300, 250, 200, 150, and 100 K, respectively. Upon cooling from 300K down to 100 K, the emission features continuously sharpened, leadingto a substantial increase in the signal around 575 nm. Decompositionof photoluminescence spectrum confirms the close relevance betweenradiative recombination of singlet excitons and molecular thermalvibration. Theoretically, based on a traditional three-state reactionmodel of “S 1 +S 0 ↔ 1 (TT) i ↔T 1 +T 1 ”, all measured fluorescencedecay curves could be well fitted by using a set of coupled rate equations.Then the important rate constants involved in singlet exciton fissionprocess were obtained by curve-fitting. It was found that the functionalrelationship between the transition rate of “S 1 +S 0 → 1 (TT) i ” process and temperaturewas accordant with the conventional Arrhenius law. This was in linewith the endothermic nature of singlet exciton fission in rubrenematerial. Furthermore, according to the detailed balance conditionof molecular reaction dynamics and Arrhenius laws, the experimentallydetermined energy difference in endothermic reaction was consistentwith its theoretical value. These results are of significance forclarifying the microscopic picture and physical mechanism of excitonfission. Finally, we give some deep analysis about the variation oftemperature-dependences of singlet fission processes in rubrene andtetracene materials with different morphology." @default.
- W2602437639 created "2017-04-07" @default.
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- W2602437639 date "2017-03-23" @default.
- W2602437639 modified "2023-09-24" @default.
- W2602437639 title "Studying the temperature-dependence of singlet exciton fission by using transient fluorescence technique" @default.
- W2602437639 doi "https://doi.org/10.1360/sspma2016-00376" @default.
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